SMTP / IP Address Rotation

I have VPS with Interspire running. My requirment is to send small volume of 25 to 50k email sending per day when requirment. I have currently 2 IP but can get more stack of IP or VPS.

I need help and assistance of seting up my email server of rotate SMTP domains on a vps for 8 to 20 SMTP server with one front end server, Front end server domain plus IP should be invisible on internet while domain and ip need to be visible of smtp server and the SMTP server ips which are rotating.

I saw lots of guys claiming to be expert but so far none is capable but offering their own services of email broadcasting. I need the magic man to work with me. Is any one there ?

We have over 7 years of experience in setting up servers for companies, individuals and organizations which require mass emails for marketing, invites, newsletters, etc.
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